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| org.apache.jcs.auxiliary.remote.RemoteCacheFactory |
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| 1 | package org.apache.jcs.auxiliary.remote; |
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| 2 | ||
| 3 | /* |
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| 4 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 5 | * or more contributor license agreements. See the NOTICE file |
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| 6 | * distributed with this work for additional information |
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| 7 | * regarding copyright ownership. The ASF licenses this file |
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| 8 | * to you under the Apache License, Version 2.0 (the |
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| 9 | * "License"); you may not use this file except in compliance |
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| 10 | * with the License. You may obtain a copy of the License at |
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| 11 | * |
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| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 13 | * |
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| 14 | * Unless required by applicable law or agreed to in writing, |
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| 15 | * software distributed under the License is distributed on an |
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| 16 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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| 17 | * KIND, either express or implied. See the License for the |
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| 18 | * specific language governing permissions and limitations |
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| 19 | * under the License. |
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| 20 | */ |
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| 21 | ||
| 22 | import java.util.ArrayList; |
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| 23 | import java.util.HashMap; |
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| 24 | import java.util.StringTokenizer; |
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| 25 | ||
| 26 | import org.apache.commons.logging.Log; |
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| 27 | import org.apache.commons.logging.LogFactory; |
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| 28 | import org.apache.jcs.auxiliary.AuxiliaryCache; |
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| 29 | import org.apache.jcs.auxiliary.AuxiliaryCacheAttributes; |
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| 30 | import org.apache.jcs.auxiliary.AuxiliaryCacheFactory; |
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| 31 | import org.apache.jcs.engine.behavior.ICache; |
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| 32 | import org.apache.jcs.engine.behavior.ICompositeCacheManager; |
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| 33 | ||
| 34 | /** |
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| 35 | * The RemoteCacheFactory creates remote caches for the cache hub. It returns a no wait facade which |
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| 36 | * is a wrapper around a no wait. The no wait object is either an active connection to a remote |
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| 37 | * cache or a balking zombie if the remote cache is not accessible. It should be transparent to the |
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| 38 | * clients. |
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| 39 | */ |
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| 40 | 0 | public class RemoteCacheFactory |
| 41 | implements AuxiliaryCacheFactory |
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| 42 | { |
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| 43 | 0 | private final static Log log = LogFactory.getLog( RemoteCacheFactory.class ); |
| 44 | ||
| 45 | private String name; |
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| 46 | ||
| 47 | /** store reference of facades to initiate failover */ |
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| 48 | 0 | private final static HashMap facades = new HashMap(); |
| 49 | ||
| 50 | /** |
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| 51 | * For LOCAL clients we get a handle to all the failovers, but we do not register a listener |
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| 52 | * with them. We create the RemoteCacheManager, but we do not get a cache. The failover runner |
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| 53 | * will get a cache from the manager. When the primary is restored it will tell the manager for |
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| 54 | * the failover to deregister the listener. |
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| 55 | * <p> |
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| 56 | * (non-Javadoc) |
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| 57 | * @see org.apache.jcs.auxiliary.AuxiliaryCacheFactory#createCache(org.apache.jcs.auxiliary.AuxiliaryCacheAttributes, |
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| 58 | * org.apache.jcs.engine.behavior.ICompositeCacheManager) |
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| 59 | */ |
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| 60 | public AuxiliaryCache createCache( AuxiliaryCacheAttributes iaca, ICompositeCacheManager cacheMgr ) |
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| 61 | { |
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| 62 | 0 | RemoteCacheAttributes rca = (RemoteCacheAttributes) iaca; |
| 63 | ||
| 64 | 0 | ArrayList noWaits = new ArrayList(); |
| 65 | ||
| 66 | // if LOCAL |
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| 67 | 0 | if ( rca.getRemoteType() == RemoteCacheAttributes.LOCAL ) |
| 68 | { |
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| 69 | // a list toi be turned into an array of failover server information |
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| 70 | 0 | ArrayList failovers = new ArrayList(); |
| 71 | ||
| 72 | // not necessary if a failover list is defined |
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| 73 | // REGISTER PRIMARY LISTENER |
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| 74 | // if it is a primary |
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| 75 | 0 | boolean primayDefined = false; |
| 76 | 0 | if ( rca.getRemoteHost() != null ) |
| 77 | { |
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| 78 | 0 | primayDefined = true; |
| 79 | ||
| 80 | 0 | failovers.add( rca.getRemoteHost() + ":" + rca.getRemotePort() ); |
| 81 | ||
| 82 | 0 | RemoteCacheManager rcm = RemoteCacheManager.getInstance( rca, cacheMgr ); |
| 83 | 0 | ICache ic = rcm.getCache( rca ); |
| 84 | 0 | if ( ic != null ) |
| 85 | { |
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| 86 | 0 | noWaits.add( ic ); |
| 87 | 0 | } |
| 88 | else |
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| 89 | { |
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| 90 | 0 | log.info( "noWait is null" ); |
| 91 | } |
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| 92 | } |
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| 93 | ||
| 94 | // GET HANDLE BUT DONT REGISTER A LISTENER FOR FAILOVERS |
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| 95 | 0 | String failoverList = rca.getFailoverServers(); |
| 96 | 0 | if ( failoverList != null ) |
| 97 | { |
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| 98 | 0 | StringTokenizer fit = new StringTokenizer( failoverList, "," ); |
| 99 | 0 | int fCnt = 0; |
| 100 | 0 | while ( fit.hasMoreElements() ) |
| 101 | { |
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| 102 | 0 | fCnt++; |
| 103 | ||
| 104 | 0 | String server = (String) fit.nextElement(); |
| 105 | 0 | failovers.add( server ); |
| 106 | ||
| 107 | 0 | rca.setRemoteHost( server.substring( 0, server.indexOf( ":" ) ) ); |
| 108 | 0 | rca.setRemotePort( Integer.parseInt( server.substring( server.indexOf( ":" ) + 1 ) ) ); |
| 109 | 0 | RemoteCacheManager rcm = RemoteCacheManager.getInstance( rca, cacheMgr ); |
| 110 | // add a listener if there are none, need to tell rca what |
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| 111 | // number it is at |
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| 112 | 0 | if ( ( !primayDefined && fCnt == 1 ) || noWaits.size() <= 0 ) |
| 113 | { |
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| 114 | 0 | ICache ic = rcm.getCache( rca ); |
| 115 | 0 | if ( ic != null ) |
| 116 | { |
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| 117 | 0 | noWaits.add( ic ); |
| 118 | 0 | } |
| 119 | else |
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| 120 | { |
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| 121 | 0 | log.info( "noWait is null" ); |
| 122 | } |
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| 123 | } |
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| 124 | 0 | } |
| 125 | // end while |
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| 126 | } |
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| 127 | // end if failoverList != null |
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| 128 | ||
| 129 | 0 | rca.setFailovers( (String[]) failovers.toArray( new String[0] ) ); |
| 130 | ||
| 131 | // if CLUSTER |
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| 132 | 0 | } |
| 133 | 0 | else if ( rca.getRemoteType() == RemoteCacheAttributes.CLUSTER ) |
| 134 | { |
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| 135 | // REGISTER LISTENERS FOR EACH SYSTEM CLUSTERED CACHEs |
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| 136 | 0 | StringTokenizer it = new StringTokenizer( rca.getClusterServers(), "," ); |
| 137 | 0 | while ( it.hasMoreElements() ) |
| 138 | { |
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| 139 | // String server = (String)it.next(); |
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| 140 | 0 | String server = (String) it.nextElement(); |
| 141 | // p( "tcp server = " + server ); |
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| 142 | 0 | rca.setRemoteHost( server.substring( 0, server.indexOf( ":" ) ) ); |
| 143 | 0 | rca.setRemotePort( Integer.parseInt( server.substring( server.indexOf( ":" ) + 1 ) ) ); |
| 144 | 0 | RemoteCacheManager rcm = RemoteCacheManager.getInstance( rca, cacheMgr ); |
| 145 | 0 | rca.setRemoteType( RemoteCacheAttributes.CLUSTER ); |
| 146 | 0 | ICache ic = rcm.getCache( rca ); |
| 147 | 0 | if ( ic != null ) |
| 148 | { |
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| 149 | 0 | noWaits.add( ic ); |
| 150 | 0 | } |
| 151 | else |
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| 152 | { |
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| 153 | 0 | log.info( "noWait is null" ); |
| 154 | } |
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| 155 | 0 | } |
| 156 | ||
| 157 | } |
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| 158 | // end if CLUSTER |
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| 159 | ||
| 160 | 0 | RemoteCacheNoWaitFacade rcnwf = new RemoteCacheNoWaitFacade( (RemoteCacheNoWait[]) noWaits |
| 161 | .toArray( new RemoteCacheNoWait[0] ), rca, cacheMgr ); |
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| 162 | ||
| 163 | 0 | getFacades().put( rca.getCacheName(), rcnwf ); |
| 164 | ||
| 165 | 0 | return rcnwf; |
| 166 | } |
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| 167 | ||
| 168 | // end createCache |
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| 169 | ||
| 170 | /** |
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| 171 | * Gets the name attribute of the RemoteCacheFactory object |
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| 172 | * @return The name value |
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| 173 | */ |
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| 174 | public String getName() |
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| 175 | { |
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| 176 | 0 | return this.name; |
| 177 | } |
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| 178 | ||
| 179 | /** |
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| 180 | * Sets the name attribute of the RemoteCacheFactory object |
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| 181 | * @param name The new name value |
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| 182 | */ |
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| 183 | public void setName( String name ) |
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| 184 | { |
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| 185 | 0 | this.name = name; |
| 186 | 0 | } |
| 187 | ||
| 188 | /** |
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| 189 | * The facades are what the cache hub talks to. |
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| 190 | * @return Returns the facades. |
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| 191 | */ |
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| 192 | public static HashMap getFacades() |
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| 193 | { |
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| 194 | 0 | return facades; |
| 195 | } |
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| 196 | ||
| 197 | } |
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